Steps to reproduce:

1. create a dashboard with a honeycomb
2. use as item pattern "CPU utilization"
3. set as item filter "class" contains "os"
4. save

Result:

honeycomb shows "no data"

Expected:

all host with "CPU utilization" from the "Linux by Zabbix agent" template, "class" "os" is set in this template

The Apache template and the Redis template have also the item "CPU utilization". When you have a server with linux, redis and apache all three "CPU utilization" are shown.